Acta Anatomica Sinica ›› 2022, Vol. 53 ›› Issue (2): 210-216.doi: 10.16098/j.issn.0529-1356.2022.02.011

• Anatomy • Previous Articles     Next Articles

Cone-beam CT analysis of occlusal planes between different vertical skeletal types of adult class Ⅱ malocclusions in Shandong province

ZHANG Tian-zhen1,2  ZHENG Xin-yu1 ZHANG Wei1 HE Zi-jing1 WANG Ling-zhi1  REN Da-peng1 YUAN Xiao1*   

  1. 1. Department of Orthodontics, the Affiliated Hospital of Qingdao University, Qingdao 266003, China; 2. The 2019 Graduate Student in Orthodontics, School of Stomatology of Qingdao University, Shandang Qingdao 266003, China
  • Received:2021-04-12 Revised:2021-05-09 Online:2022-04-06 Published:2022-04-06
  • Contact: YUAN Xiao E-mail:yuanxiaoqd@163.com

Abstract:

Objective To investigate the cant of the occlusal planes in Chinese adult class Ⅱ malocclusions with hypodivergent, normodivergent, and hyperdivergent facial vertical patterns using cone-beam CT.   Methods The descriptive, cross-sectional study evaluated 123 cephalogram from CBCT(CCB) of patients in Department of Orthodontics, the Affiliated Hospital of Qingdao University. According to cephalometric analysis, 89 Chinese adult class Ⅱ patients were divided into three groups according to the angle between FH-MP and the angle between SN-MP. In comparison, 34 Class Ⅰ normodivergent malocclusions individuals were selected as the control group. Comparing the cephalometric result  between 4 groups.   Results As expected,the hyperdivergent group had steeper anterior occlusal planes(14.73±3.76) ° and posterior occlusal planes(21.42±5.77)°, there was a significant statistical difference between the hyperdivergent group and other 2 groups in class Ⅱ patients (P<0.05). The height of maxillary second molar increased from high angle group to low angle group (P<0.01).   Conclusion There are different characters of the occlusal planes in varied vertical facial pattern. The inclinations of anterior and posterior occlusal planes in Chinese class Ⅱ hyperdivergent group were steeper than other 3 groups. The difference of posterior occlusal plane inclination is mainly caused by the height of maxillary second molar.

Key words: Three-dimensional cephalometry, Class Ⅱ malocclusions, Inclination of the occlusal plane, Anterior and posterior occlusal plane, Vertical skeletal type, Cone-beam CT, Human

CLC Number: